I have an older version of UiPath that does not have “Subtract” but I want to decrease a number, pulled from an excel sheet, to be one year less. For example, if I am pulling 2019, I want the number to actually be 2018. How can I do this without the Subtract Formula function?

# How to decrease number without using Add or Subtract?

Let us take you retrieved a value from Excel as **strA**

Create One more variable **strb**

Now use Assign Activity

`strb = (Convert.ToInt32(strA)-1).ToString`

Regards,

Mahesh

Hello @Mitchell_Binder

first you have to inject python and then pass two value in that argument of activity.

**.py file**

int subtractValue(x,y)

{

`while`

`(y != 0)`

`{ `

` `

`int`

`borrow = (~x) & y;`

`x = x ^ y; `

` `

`y = borrow << 1;`

`}`

` `

`return`

`x;`

}